CN208568909U - A kind of resistance meter - Google Patents
A kind of resistance meter Download PDFInfo
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- CN208568909U CN208568909U CN201820692165.3U CN201820692165U CN208568909U CN 208568909 U CN208568909 U CN 208568909U CN 201820692165 U CN201820692165 U CN 201820692165U CN 208568909 U CN208568909 U CN 208568909U
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- 238000012360 testing method Methods 0.000 claims abstract description 47
- 239000004020 conductor Substances 0.000 claims abstract description 20
- 230000005611 electricity Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model provides a kind of resistance meter, it is characterised in that in parallel subsidiary loop, test loop include DC power supply, electric current binding post, ampere wires, product to be tested on the test loop of resistance meter；Current transformer two is mounted on test loop；Subsidiary loop includes voltage conductor, voltage link column, measuring resistance；Current transformer one is mounted on subsidiary loop；Current transformer one, current transformer two secondary circuit be electrically connected with data processing unit, test loop electric current I and subsidiary loop electric current I ' are measured respectively, data processing unit is according to subsidiary loop electric current I ' and measuring resistance resistance value R ', calculate pressure drop △ U=I ' * R ', due to parallel relationship, the pressure drop of subsidiary loop is the pressure drop at product to be tested both ends in test loop, further calculates out resistance R=△ U/ (I-I ') of product to be tested.
Description
Technical field
The utility model relates to arrive component resistivity-measuring devices field, particularly a kind of resistance meter.
Background technique
Common circuit resistance tester principle used at present is using four-line measurement method, i.e., at product to be tested both ends point
Not Lian Jie two ampere wires and two voltage conductors, voltage conductor is closer from product to be tested, ampere wires from product to be tested compared with
Far；Product to be tested is connected in the current loop of tester by two ampere wires, so that product to be tested is flowed through greater than 100A's
DC test electric current, two voltage conductors are connected in parallel on the both ends of product to be tested and are connected with voltage measuring apparatus, and measurement is tested
The voltage drop value at test product both ends, microprocessor calculate the ratio between voltage drop value and current value by the voltage drop value of reading voltage measuring apparatus
Obtain the resistance value of product to be tested, i.e. R=△ U/I.
In testing, voltage conductor is using on line tweezer clamping connection to product to be tested, due to line for the test of such loop resistance
Misoperation when clamp oxidation or connection generates virtual connection phenomenon between wire clamp pincers and product to be tested, leads to the presence of contact resistance,
The contact resistance can produce bigger effect measuring accuracy, and this influence many times can not manually differentiate in test, most
Leading to test result eventually, there are errors.
Summary of the invention
To solve the above-mentioned problems, a kind of resistance meter provided by the utility model, it is characterised in that resistance meter
Test loop on subsidiary loop in parallel；The test loop includes DC power supply, electric current binding post, ampere wires, is tested
Test product, current transformer two；The subsidiary loop includes voltage conductor, voltage link column, measuring resistance, current transformer one；
The current transformer two is mounted on test loop；The measuring resistance is connected on subsidiary loop by voltage conductor；Institute
Current transformer one is stated to be mounted on subsidiary loop；The secondary circuit and data of the current transformer one, current transformer two
Processing unit electrical connection.
When test, two ampere wires are connected with product to be tested, at this time DC power supply, electric current binding post product to be tested
Test loop is constituted after ampere wires connect；Current transformer two can measure the electric current in test loop；By two electricity
Pressure conducting wire is connected with product to be tested, and measuring resistance is connected through voltage conductor with product to be tested at this time, constitutes subsidiary loop；Electricity
Current transformer one can measure the electric current in subsidiary loop.
After being attached by the above method, subsidiary loop has just been connected in parallel on test loop.
After opening the power switch on panel, test loop has electric current to flow through, i.e., product to be tested has electric current to flow through.Due to quilt
For test article with the presence of resistance, the product to be tested both ends in test loop can generate pressure drop △ U；It will be produced in subsidiary loop at this time
Raw electric current I ', the secondary current of current transformer one is read by data processing unit, calculates subsidiary loop actual current I ',
The voltage drop value of subsidiary loop, i.e. △ U=I ' * R ' are calculated using voltage computing formula.
Since subsidiary loop and test loop are parallel relationships, the pressure drop of subsidiary loop is product to be tested in test loop
The pressure drop △ U at both ends is read the secondary current of current transformer two by data processing unit, calculates the electric current of test loop
I calculates the resistance value of product to be tested, i.e. R=△ U/ (I-I ') using resistance calculations formula.
The utility model advantage is: the resistance value of product to be tested is generally in tens micro-ohms between tens milliohms, i.e., electric
The range of tester is hindered, the resistance value of the measuring resistance in subsidiary loop is selected according to the resistance value of product to be tested, generally existed
For several milliohms between several Europe, i.e. the resistance value of measuring resistance is usually between 100 times to 1000 times of product to be tested；If choosing mark
The resistance value of quasi- resistance is 100 times of product to be tested resistance value, when the connection position of voltage conductor and product to be tested be equipped with one and by
When the comparable contact resistance of test article, then influence of this contact resistance for test result only has 2/1000ths, if chosen
When the resistance value of measuring resistance is 1000 times of product to be tested resistance value, then influence of this contact resistance for test result only has
2/10000ths；It can be seen that the contact resistance of the link position of voltage conductor and product to be tested, influences the precision of test result
It is very small, it can be ignored, to substantially increase the reliability of test result.
The advantages of the utility model, also resides in: since the resistance value of subsidiary loop Plays resistance is far longer than product to be tested electricity
Resistance value so that the electric current generated in measuring resistance is with regard to very little, one to thousand percent point one of general only test loop electric current it
Between；In this way, the power of measuring resistance consumption is with regard to very little, it is not easy to generate heat；Especially it is powered for a long time survey in resistance meter
When examination, can debase the standard resistance heating to greatest extent, the variation of measuring resistance resistance value caused by avoiding due to fever；And it marks
The resistance value of quasi- resistance is a fundamental parameter of the utility model, ensure that the precision of this underlying parameter, can make
Test result is more accurate, reliable.
Detailed description of the invention
Fig. 1: system schematic；
Fig. 2: panel schematic diagram；
Fig. 3: schematic diagram calculation；
1. electric power incoming line, 2. power switches, 3. electric current binding posts, 4. voltage link columns, 5. resistance adjustment knobs, 6. displays
Device, 7. panels, 8. ampere wires, 9. voltage conductors, 10. ampere wires tie points, 11. voltage conductor tie points, 12. is tested
Product, 13. current transformers one, 14. measuring resistances, 15. current transformers two, 16. data processing units, 17. DC power supplies,
18. pedestal.
Specific embodiment
The embodiments of the present invention is illustrated with reference to the accompanying drawing:
A kind of resistance meter, referring to Figures 1 and 2, structure include panel 7 and pedestal 18；On panel 7 comprising power supply into
Line 1, power switch 2, electric current binding post 3, voltage link column 4, resistance adjustment knob 5, display 6；It include electric current on pedestal 18
Mutual inductor 1, measuring resistance 14, current transformer 2 15, data processing unit 16, DC power supply 17；Current transformer one
13, the secondary circuit of current transformer 2 15 is electrically connected with data processing unit 16.
Specifically, two ampere wires 8 are connected in the position of ampere wires tie point 10 with product to be tested 12 when test
It connects, DC power supply 17, electric current binding post 3 constitute test loop after connecting with product to be tested 12 through ampere wires 8 at this time；Electric current is mutual
Sensor 2 15 can measure the electric current in test loop.
Further, two voltage conductors 9 are connected in the position of voltage conductor tie point 11 with product to be tested 12, at this time
Measuring resistance 14 is connected through voltage conductor 9 with product to be tested 12, constitutes subsidiary loop；Current transformer 1 can measure
Electric current in subsidiary loop.
Further, after being attached by the above method, subsidiary loop has just been connected in parallel on test loop.
Further, after opening the power switch 2 on panel 7, test loop has electric current to flow through, i.e., product to be tested 12 has electric current
It flows through.
Further, since product to be tested 12 is with the presence of resistance, 12 both ends of product to be tested can generate pressure drop △ in test loop
U.Electric current I ' will be generated in subsidiary loop at this time, the secondary electricity of current transformer 1 is read by data processing unit 16
Stream, is calculated subsidiary loop actual current I ', the voltage drop value of subsidiary loop, i.e. △ U=I ' * is calculated using voltage computing formula
R’。
Further, since subsidiary loop and test loop are parallel relationships, the pressure drop of subsidiary loop is in test loop
The voltage drop value at 12 both ends of product to be tested is read the secondary current of current transformer 2 15 by data processing unit 16, calculated
The electric current I of test loop calculates the resistance value of product to be tested 12, i.e. R=△ U/ (I-I ') using resistance calculations formula.
In test loop, product to be tested is that diversified, small resistance value is possible to only tens micro-ohms, and big resistance value may
There are tens milliohms, thousand times of difference is even more, in order to meet measurement demand, the measuring resistance in subsidiary loop is made into adjustable
Resistance or the combination of the fixed resistance of multiple and different resistance values will using resistance adjustment knob 5 according to the resistance sizes of product to be tested
The resistance value of measuring resistance 14 is adjusted, so that the electric current I ' in subsidiary loop, being maintained at a current transformer 1 can be with
Within the scope of precise measurement, to guarantee more accurately to calculate the resistance value of product to be tested 12.
Referring to Fig. 3, by calculating, feasibility analysis to the utility model:
It is calculated by taking 10mm2,1 meter of length of copper conductor as an example, is looked into the resistance of this section of copper conductor known to technical data
The Ω of value RO=0.00175；Assuming that the connection position of voltage conductor and product to be tested is equipped with contact resistance R1=0.002 Ω.
Calculated example 1: when the resistance value (Ω of R '=0.175) of measuring resistance is 100 times of product to be tested resistance value:
When electric current (I=100A) flows through product to be tested, an electric current I ' is generated to subsidiary loop, at this time:
I '=(I*R0)/(R '+R1)=(100A*0.00175 Ω)/(0.175+0.002) Ω=0.9887A.
Further calculate out the voltage drop value △ U of subsidiary loop:
△U=I’*R’=0.9887A*1.75Ω=0.173V。
Further calculate out product to be tested resistance RO ':
RO’=△U/(I-I’)=0.173V/(100A-09887A)=0.001747Ω。
The resistance value of this data and practical product to be tested is compared:
RO’/RO*100%=0.001747Ω/0.00175*100%=99.8%。
Calculated example 2: when the resistance value (Ω of R '=1.75) of measuring resistance is 1000 times of product to be tested resistance value:
When electric current (I=100A) flows through product to be tested, an electric current I ' is generated to subsidiary loop, at this time:
I '=(I*R0)/(R '+R1)=(100A*0.00175 Ω)/(1.75+0.002) Ω=0.09988A.
Further calculate out the voltage drop value △ U of subsidiary loop:
△U=I’*R’=0.09988A*1.75Ω=0.1748V。
Further calculate out product to be tested resistance RO ':
RO’=△U/(I-I’)=0.1748V/(100A-0.09988A)=0.001749Ω。
The resistance value of this data and practical product to be tested is compared:
RO’/RO*100%=0.001749Ω/0.00175*100%=99.98%。
Pass through above-mentioned two calculated example, it can be seen that the contact resistance that artificial maloperation generates, to the essence of test result
Degree influence is very small, can be ignored, to substantially increase the reliability of test result.
Finally it should be noted that: technological means disclosed in the utility model is not limited only to disclosed in above embodiment
Technological means, also comprising using embodiment composed by above technology any combination, all in the protection model of the utility model
In enclosing.
Claims (2)
1. a kind of resistance meter, it is characterised in that subsidiary loop in parallel on the test loop of resistance meter；
The test loop includes DC power supply, electric current binding post, ampere wires, product to be tested, current transformer two；
The subsidiary loop includes voltage conductor, voltage link column, measuring resistance, current transformer one；
The current transformer two is mounted on test loop；
The measuring resistance is connected on subsidiary loop by voltage conductor；
The current transformer one is mounted on subsidiary loop；
The current transformer one, current transformer two secondary circuit be electrically connected with data processing unit.
2. a kind of resistance meter according to claim 1, it is characterized in that the measuring resistance in subsidiary loop can be one
The resistance of a adjustable resistance value or the resistance combination of multiple and different fixed resistance values form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820692165.3U CN208568909U (en) | 2018-05-10 | 2018-05-10 | A kind of resistance meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820692165.3U CN208568909U (en) | 2018-05-10 | 2018-05-10 | A kind of resistance meter |
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| Publication Number | Publication Date |
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| CN208568909U true CN208568909U (en) | 2019-03-01 |
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| CN201820692165.3U Active CN208568909U (en) | 2018-05-10 | 2018-05-10 | A kind of resistance meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112114198A (en) * | 2020-08-26 | 2020-12-22 | 深圳供电局有限公司 | Loop resistance testing device and system |
-
2018
- 2018-05-10 CN CN201820692165.3U patent/CN208568909U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112114198A (en) * | 2020-08-26 | 2020-12-22 | 深圳供电局有限公司 | Loop resistance testing device and system |
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